Teaching Apprentices

There is a small alley diagonally opposite the women's clothing shop. A child is standing by the wall at the entrance of the alley, sticking half of his head out to glance at the opposite side.
"Xuan'er!" Suddenly a hand reached out from behind and patted the child on the back.
Xuan'er was startled and quickly turned around to look, only to see a dark-faced young man standing behind him. Although the black-faced young man had a gentle expression, his eyes were as sharp as lightning.
"Master!"...